Method for the preparation of composite membranes based on interpenetrating polymer networks

摘要

Semipermeable composite membranes which comprise an interpenetrating polymer network may be prepared by reacting polyethylene glycol with a toluene diisocyanate to form an isocyanate-capped polyether, thereafter admixing the isocyanate-capped polyether with a heterocyclic nitrogen- containing compound to form an interpenetrating polymer network membrane- forming composition, forming a film of the composition on a porous support backing material and curing the resultant composite in a hydrous atmosphere to generate an amine-capped polymer, and subsequently reacting a portion of the isocyanate groups present to form a substituted polyurea which will physically enter the heterocyclic nitrogen-containing compound in the membrane.